US20230038115A1 - Laser-printable film and packaging in which same is used - Google Patents

Laser-printable film and packaging in which same is used Download PDF

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Publication number
US20230038115A1
US20230038115A1 US17/786,799 US202017786799A US2023038115A1 US 20230038115 A1 US20230038115 A1 US 20230038115A1 US 202017786799 A US202017786799 A US 202017786799A US 2023038115 A1 US2023038115 A1 US 2023038115A1
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Prior art keywords
film
polyolefin
less
preferred
layer
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English (en)
Inventor
Shintaro Ishimaru
Masayuki Haruta
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Toyobo Co Ltd
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Toyobo Co Ltd
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Assigned to TOYOBO CO., LTD. reassignment TOYOBO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARUTA, MASAYUKI, ISHIMARU, Shintaro
Publication of US20230038115A1 publication Critical patent/US20230038115A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/027—Thermal properties
    • B32B7/028—Heat-shrinkability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D23/00—Details of bottles or jars not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B32B2264/1022—Titania
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/30—Particles characterised by physical dimension
    • B32B2264/303—Average diameter greater than 1µm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
    • B32B2310/0843—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation using laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2435/00—Closures, end caps, stoppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2519/00—Labels, badges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene

Definitions

  • the present invention relates to film capable of being favorably used in packaging comprising printing or other such display.
  • the present invention relates to polyolefin-based film permitting printing by means of a laser, and also relates to packaging comprising label(s) and/or lid member(s) corresponding thereto.
  • Packaging has conventionally been employed in supply chain goods as typified by foods, pharmaceutical agents, and industrial products. For the most part, such packaging not only protects the contents but also has the role of displaying information pertaining to the product name, manufacturing date, raw materials, and so forth.
  • labels at which adhesive is applied on the back surface of a substrate permitting printing by means of thermal transfer or ink as described for example at Patent Reference No. 1 are in wide use.
  • a tack label is such that information is printed in advance on the front surface constituting the display surface thereof, and while in this state is affixed to a release sheet (liner), this being removed from the liner and affixed to packaging during use.
  • Patent Reference No. 2 discloses a heat-sensitive film having a heat-sensitive recording layer. Because the film of Patent Reference No. 2 changes color when affected by heat, the packaging itself has display capability. For this reason, it does not require use of the foregoing tack label. Furthermore, because, during an operation in which a pouch is formed from packaging employing a film such as that at Patent Reference No. 2, it will be possible, by incorporating a thermal printer or other such printing device therein, to cause pouch forming and display to be completed in a single operation, it has also contributed to reduction in labor and reduction in cost. Because of the advantages possessed thereby, techniques in which printing is carried out directly on the packaging itself have recently become popular.
  • Patent Reference No. 3 discloses a multi layer laminated film for laser printing in which a printing layer comprises a layer consisting of an ink composition that is capable of being printed by means of laser light. Use of this film makes it possible to cause change in color at locations irradiated by a laser, permitting printing to be carried out. Note, however, that because multilayer laminated films such as the film disclosed at Patent Reference No. 3 like the film of Patent Reference No. 2 require that a printing layer be provided over the film substrate, problems such as delamination of layers and reduction in productivity remain unsolved.
  • Patent Reference No. 4 discloses an additive for laser marking that consists of bismuth oxide. Kneading this additive into a plastic makes it possible to cause change in color at locations irradiated by a laser, permitting printing to be carried out. Whereas plastics alone do not normally undergo reaction due to lasers, this additive can be made to undergo excitation by the energy from a laser, making it possible to cause a change in the color of the plastic. Because the additive is disposed at the interior of the film, the fact that the delamination of functional layers which occurred with coatings tends not to occur makes this useful. But because the additive is metal particulate, the problem remains that like the foregoing coating this causes reduction in the transparency of the film. Furthermore, the inventor(s) discovered that kneading particles into the film results in a problem in that unevenness in film thickness occurs when the film is stretched.
  • the present invention is constituted as follows.
  • haze thereof is not less than 1% but not greater than 30%;
  • unevenness in thickness thereof in either a machine direction or a transverse direction is not less than 0.1% but not greater than 25%.
  • the present invention makes it possible to provide a film in accordance therewith that is capable of being printed in distinct fashion by a laser, that excels with respect to unevenness in thickness, and that is of high transparency. It at the same time an object of the present invention to make it possible to provide packaging which employs such film and on which printing has been directly carried out.
  • FIG. 1 Image printed by causing film in accordance with Working Example 1 to be irradiated by a laser
  • Polyolefin-based film in accordance with the present invention has at least one layer permitting printing by means of a laser, and preferably has properties and constitution as described below.
  • pigment having ability to cause film color to change when acted on by laser irradiation (hereinafter sometimes referred to simply as “pigment”) must be added thereto.
  • the polyolefin resin that makes up film will itself have almost no reaction to laser light, it is ordinarily incapable of permitting printing by means of laser irradiation.
  • Pigment can be made to undergo excitation by the energy from laser light, and cause carburization of the surrounding polyolefin resin (preferred conditions for laser irradiation will be described below).
  • pigment type any of bismuth, gadolinium, neodymium, titanium, antimony, tin, and aluminum—whether present metal alone or in metal oxide form—may be cited. Furthermore, it is preferred that pigment particle diameter be not less than 0.1 ⁇ m but not greater than 10 ⁇ m. When pigment particle diameter is less than 0.1 ⁇ m, there is a possibility that change in color when irradiated by a laser will no longer be adequate. Furthermore, when particle diameter is greater than 10 ⁇ m, there is a tendency for film haze to exceed 30%, and for the color b value to exceed 2. It is more preferred that particle diameter be not less than 0.5 ⁇ m but not greater than 9 ⁇ m.
  • the amount of pigment added within the laser printing layer be not less than 100 ppm but not greater than 3000 ppm.
  • the amount of pigment that is added thereto is less than 100 ppm, this is not preferred because the print density produced by the laser will no longer be adequate.
  • the amount of pigment that is added thereto is greater than 3000 ppm, this is not preferred because there will be a tendency for film haze, color value, and unevenness in thickness to exceed prescribed ranges therefor. With respect to the effect that addition of pigment has on haze and color value, this is caused not only by the color of the pigment itself but is also due to scattering of light by pigment particles.
  • the amount of pigment that is added thereto be not less than 150 ppm but not greater than 2950 ppm, and still more preferred that this be not less than 200 ppm but not greater than 2900 ppm.
  • the equivalent amount of pigment that would need to be added when expressed as a fraction of all layers of the film may be not less than 1.00 ppm but not greater than 3000 ppm.
  • the equivalent amount of pigment to be added when expressed as a fraction of all layers of the film will result in a calculation indicating that will be less than the amount at the laser printing layer.
  • the laser printing layer makes up the major part (50% or more) of the total thickness of all layers, and the fact that increasing the thickness of other layer(s) would cause relative decrease in the thickness of the laser printing layer to the point where it would be too thin and this would cause printing precision to be sacrificed, the equivalent amount of pigment when expressed as a fraction of all layers of the film can be taken to be an approximation of the amount contained in the laser printing layer.
  • a vented kneader extruder is used to cause polyolefin-based resin raw material and a slurry in which the particles are dispersed in solvent to be blended
  • methods in which a kneader extruder is used to cause the particles and polyolefin to be blended may also be cited.
  • methods in which a kneader extruder is used to cause the particles and polyolefin to be blended are preferred.
  • polystyrene raw material that makes up the film of the present invention
  • polypropylene (PP) polypropylene
  • PE polyethylene
  • other such homopolymers may be cited as examples.
  • polypropylene there is no particular limitation with respect to stereoregularity, it being possible for this to be isotactic, syndiotactic, and/or atactic, it being possible for these to be present therein in any desired fractional percentage(s).
  • polyethylene there is no particular limitation with respect to the density (degree of branching) thereof, it being possible for this to be high density (HDPE), linear low density (LLDPE), and/or low density (LDPE).
  • HDPE high density
  • LLDPE linear low density
  • LDPE low density
  • raw materials in which two or more different types of monomers are copolymerized may be used; examples of monomers that may be used for copolymerization which may be cited including ethylene, ⁇ -olefins, and so forth; examples of ⁇ -olefins which may be cited including propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 4-methyl-1-pentene, 4-methyl-1-hexene, and so forth.
  • the type of copolymerization may be random copolymerization and/or block copolymerization.
  • polyolefin e polyolefin
  • melt flow rate (MFR) of polyolefin resin serving as raw material While there is no particular limitation with respect to the melt flow rate (MFR) of polyolefin resin serving as raw material, it being possible for this be freely chosen as desired, it is preferred that this be 1 g/10 min to 10 g/10 min. When MFR is less than 1 g/10 min, this is not preferred because it would cause the melt viscosity of the raw material to be too high, as a result of which the resin pressure at the time of extruding operation(s) during film formation would be too high, which would tend to cause occurrence of deformation of filter(s) and so forth.
  • MFR is greater than 10 g/10 min, because this would cause molecular weight to become extremely low, there is a possibility that it would increase the tendency for fracture to occur during film formation, and/or that it would reduce resistance to blocking. It is more preferred that MFR be not less than 2 g/10 min but 8 g/10 min, and still more preferred that this be not less than 3 g/10 min but 7 g/10 min.
  • any of various additives e.g., e.g., waxes, antioxidants, antistatic agents, crystal nucleating agents, viscosity-lowering agents, thermal stabilizers, colorant pigments, antistaining agents, ultraviolet light absorbers, lubricants (antiblocking agents), and/or the like, may be added as necessary within the polyolefin resin that makes up the film of the present invention.
  • lubricant(s) such as will improve the lubricity of the film be added at least at a surfacemost layer of the film.
  • this may be freely chosen as desired, being any among silica and/or other such microparticles, fatty acid amides, alkyl sulfonates, stearates, erucic acid amides, and/or other such low molecular weight compounds, and/or the like.
  • additive(s) within the polyolefin resin that makes up the film of the present invention while these might for example be added at any desired step(s) during manufacture of the polyolefin resin, methods in which a kneader extruder is used to cause the additive(s) and polyolefin to be blended are preferred.
  • the film of the present invention have at least one layer permitting printing by means of a laser (hereinafter “laser printing layer”) and comprising pigment described at 1.1. “Pigment for Use in Laser Printing”.
  • laser printing layer As layered constitution of the film, this may be such that there is only a single layer in the form of a laser printing layer, or layer(s) other than the laser printing layer may be laminated therewith.
  • printing by means of laser takes place through carburization of the polyolefin resin that makes up the laser printing layer. For this reason, with a single-layer constitution in which there is only a laser printing layer, there is a tendency for the printing region to feel rough when touched with the fingers or the like.
  • a most-preferred layered constitution is a constitution in which there are three layers of two species, the laser printing layer being (a central layer which is) straddled by layers that do not react when acted on by laser irradiation.
  • the film of the present invention to be made to comprise layer(s) that have undergone corona treatment, coating treatment, flame treatment, and/or the like, it being possible for same to be comprised thereby as desired without departing from the requirements of the present invention.
  • the central layer may be the laser printing layer, and the surfacemost layers might for example be layers that have been made to possess respectively different functionalities such might have been accomplished by causing lubricant to be present thereat or as a result of having undergone corona treatment.
  • the film of the present invention may be provided with lettering and/or pictorial content other than that which is printed by means of laser.
  • material for constituting such lettering and/or pictorial content gravure ink, flexographic ink, and/or other such known substance(s) may be used.
  • the number of printing layer(s) there may be one such layer or there may be a plurality of such layers. So as to be able to improve design characteristics by printing a plurality of colors, it is preferred that there be printing layer(s) that comprise a plurality of layers. There will be no objection regardless of whether printing layer(s) are disposed at surfacemost layer(s) or at the central layer.
  • thickness of the laser printing layer be not less than 5 ⁇ m but not greater than 100 ⁇ m.
  • thickness of the laser printing layer is less than 5 ⁇ m, this is not preferred, as the print density produced when irradiated by a laser will be reduced, making it difficult to visually perceive lettering.
  • thickness of the laser printing layer is greater than 100 ⁇ m, this is not preferred because there will be a tendency for film haze and/or color value to exceed prescribed ranges therefor.
  • thickness of the laser printing layer be not less than 10 ⁇ m but not greater than 95 ⁇ m, and still more preferred that this be not less than 15 ⁇ m but not greater than 90 ⁇ m.
  • the film of the present invention be such that the haze thereof is not less than 1% but not greater than 30%.
  • haze is greater than 30%, this is not preferred, not only because it will cause the film to lose transparency, resulting in deterioration in ability to visually perceive contents when used as packaging, but also because it will make it difficult to visually perceive the lettering which is obtained that is produced by laser irradiation.
  • the film of the present invention requires that lettering produced by laser irradiation be readable, it requires a high degree of definiteness. It is more preferred that haze be not greater than 25%, and still more preferred that this be not greater than 20%.
  • the level of the art of the present invention is such that the lower limit of the range in values therefor is 1%, and as a practical matter it will be adequate even where the lower limit of the range in values therefor is 2%.
  • the film of the present invention be such that the color L* value thereof is not less than 90 but not greater than 98.
  • the color L* value is an indication of the lightness of the film, the higher the value the greater the lightness.
  • the color L* value is less than 90, this is not preferred, not only because it will cause the film to exhibit dull color tone, causing it to appear less visually attractive when used as packaging, but also because it will make it difficult to visually perceive the lettering which is obtained that is produced by laser irradiation.
  • the film of the present invention requires that lettering produced by laser irradiation be readable, it requires a high degree of definiteness.
  • the color L* value be not less than 90.5, and still more preferred that this be not less than 91.
  • the level of the art of the present invention is such that the upper limit of the range in values for the color L* value is 98, and as a practical matter it will be adequate even where the upper limit of the range in values therefor is 97.5.
  • the film of the present invention be such that unevenness in the thickness thereof in either the machine direction or the transverse direction be not less than 0.1% but not greater than 25%.
  • unevenness in thickness is the difference between the maximum value and the minimum value obtained when a continuous contact thickness gauge is used to measure film thickness along an arbitrary length divided by the average value thereof. The smaller the value of the unevenness in thickness the better will be the precision with respect to thickness.
  • unevenness in thickness is greater than 25%, this is not preferred because it would tend to cause occurrence of such problems as a poorly wound state due to surface irregularities and/or wrinkling and/or sagging when wound up into a roll.
  • the unevenness in thickness thereof be not greater than 23%, and still more preferred that this be not greater than 21%.
  • the level of the art of the present invention is such that 0.1% constitutes the limit thereof. It will be adequate even where the lower limit of the range in values for unevenness in thickness is 1%. It is still more preferred that unevenness in thickness be within the foregoing range in both the machine direction and the transverse direction.
  • total thickness of all layers of the film of the present invention be not less than 8 ⁇ m but not greater than 200 ⁇ m. If film thickness is less than 8 this is not preferred because it would cause handling characteristics to worsen, and would make handling difficult during printing or other such secondary treatment. On the other hand, while there would be no objection were film thickness to be greater than 200 ⁇ m, this is not preferred because it would cause the weight of film used to increase and would cause increase in chemical cost. It is more preferred that thickness of the film be not less than 13 ⁇ m but not greater than 195 ⁇ m, and still more preferred that this be not less than 18 ⁇ m but not greater than 190 ⁇ m.
  • the film of the present invention be such that thermal shrinkage thereof in either the machine direction or the transverse direction following exposure for 30 minutes to 140° C. hot air be not less than ⁇ 0.5% but not greater than 10%.
  • thermal shrinkage is greater than 10%, this is not preferred because it would cause the film to tend to deform when subjected to heat sealing or other such treatment comprising heating.
  • the upper limit of the range in values for the thermal shrinkage thereof be not greater than 9.8%, and more preferred that this be not greater than 9.6%.
  • the level of the art of the present invention is such that the lower limit of the range in values therefor is ⁇ 0.5%. As a practical matter it will be adequate even where the lower limit of the range in values for thermal shrinkage is ⁇ 0.3%. It is still more preferred that thermal shrinkage be within the foregoing range in both the machine direction and the transverse direction.
  • pigment permitting printing when acted on by laser irradiation must be present in the film. Because it is preferred that pigment be used in masterbatch form, it will ordinarily be the case that two or more species of raw material will be mixed. It has conventionally been the case that causing two or more species of raw material to be mixed and fed to an extruder has produced variation (segregation) in the supply of raw materials, and has resulted in occurrence of a problem whereby this has caused unevenness in thickness to worsen.
  • agitator(s) be installed at hopper(s) and plumbing directly above extruder(s) and that melt extrusion be carried out after raw materials have been uniformly mixed.
  • the film of the present invention may be obtained by causing the raw materials described at the foregoing “1. Raw Materials Making Up Film” to be supplied to an extruder in accordance with the method described at the foregoing “4.1. Mixture and Supply of Raw Materials,” causing the raw materials to be melt extruded by the extruder to form unstretched film, and carrying out stretching thereof in accordance with a prescribed method as described below. Note that where the film comprises laser printing layer(s) and other layer(s), there will be no objection regardless of whether the timing with which the respective layers are laminated is such that this is carried out before or after stretching.
  • lamination is carried out before stretching, it is preferred that a method be adopted in which the resins serving as raw materials for the respective layers are melt extruded at respectively different extruders, and a feedblock or the like is used partway along the resin flow paths to achieve joining thereof.
  • lamination is carried out after stretching, it is preferred that lamination in which respectively separately formed films are affixed to each other by means of adhesive and/or extruded lamination in which molten polyolefin resin is made to flow and be laminated to surface layer(s) of laminated and/or single film(s) be adopted. From the standpoint of productivity, methods in which the respective layers are laminated before stretching is carried out are preferred.
  • extrusion temperature be not less than 200° C. but not greater than 300° C.
  • extrusion temperature is less than 200° C., this is not preferred because the melt viscosity of polyolefin resin will be too high, increasing extrusion pressure and causing deformation of filter(s) present in the melt zone.
  • heating temperature is greater than 300° C., this is not preferred, because it will tend to cause occurrence of fracture during stretching.
  • a high shear rate when resin is expelled from the region of the die orifice is preferred because this will permit reduction in unevenness in thickness in the transverse direction of the film (especially in the region of maximum concavity). This is because a high shear rate will stabilize the pressure at the time that resin is expelled from the T die outlet. It is preferred that shear rate be not less than 100 sec′, even more preferred that this be not less than 150 sec ⁇ 1 , and particularly preferred that this be not less than 170 sec′. A high draft ratio is preferred in that this will cause unevenness in thickness in the machine direction to be satisfactory, but too high a draft ratio is not preferred because this would cause debris from resin and so forth to adhere to the region at which resin is expelled from the die, decreasing productivity.
  • the shear rate at the die outlet may be determined from Formula (1), below.
  • the film may be formed in accordance with any of the following techniques: unstretched; uniaxially stretched (stretching in at least one of either the vertical (machine) direction or the horizontal (transverse) direction); biaxially stretched.
  • unstretched unstretched
  • uniaxially stretched stretching in at least one of either the vertical (machine) direction or the horizontal (transverse) direction
  • biaxially stretched The description that follows is given with a focus on the sequential biaxial stretching method employing machine direction stretching-transverse direction stretching in which stretching is first carried out in the machine direction and stretching is subsequently carried out in the transverse direction.
  • Stretching in the first direction may be carried out by causing the unstretched film to be fed into a machine direction stretching device in which a plurality of groups of rollers are arranged in continuous fashion.
  • preheating roller(s) be used to carry out preheating until the film temperature reaches 100° C. to 180° C.
  • film temperature is less than 100° C., this is not preferred because stretching will be difficult at the time that stretching in the machine direction is carried out, and there will be a tendency for fracture to occur.
  • higher than 180° C. this is not preferred because the film will tend to stick to the rollers, and there will be a tendency for fouling of rollers to occur as a result of continuous production and/or winding of film on rollers.
  • the stretching ratio in the machine direction should be not less than 1 ⁇ but not greater than 10 ⁇ . As 1 ⁇ would mean that there is no stretching in the machine direction, the stretching ratio in the machine direction should be 1 ⁇ to obtain film which is uniaxially stretched in the transverse direction, and the stretching ratio in the machine direction should be not less than 1.1 ⁇ to obtain biaxially stretched film. Causing the stretching ratio in the machine direction to be not less than 1.1 ⁇ will make it possible to impart the film with molecular orientation in the machine direction and increase mechanical strength.
  • the stretching ratio in the machine direction be not less than 1.5 ⁇ but not greater than 9.5 ⁇ , and still more preferred that this be not less than 2 ⁇ but not greater than 9 ⁇ .
  • stretching in the transverse direction be carried out at a stretching ratio of on the order of 3 ⁇ to 20 ⁇ at a temperature of 120° C. to 180° C. while in a state such that the two ends in the transverse direction (the direction perpendicular to the machine direction) of the film are gripped by clips within a tenter.
  • preheating be carried out, in which case preheating should be carried out until film surface temperature reaches 110° C. to 170° C.
  • stretching ratio in the machine direction causing the stretching ratio in the transverse direction to be not less than 1.1 ⁇ will also make it possible to impart the film with molecular orientation in the transverse direction and increase mechanical strength. While there is no objection to employment of any value as the upper limit of the range in values for the stretching ratio in the transverse direction, as too great a stretching ratio will make it difficult to carry out stretching in the transverse direction and increase the tendency for fracture to occur, it is preferred that this be not greater than 20 ⁇ . It is more preferred that the stretching ratio in the machine direction be not less than 1.5 ⁇ but not greater than 19.5 ⁇ , and still more preferred that this be not less than 2 ⁇ but not greater than 19 ⁇ .
  • the film be made to pass through an intermediate zone in which no procedure such as would cause it to be actively heated is performed.
  • an intermediate zone Relative to the zone in which stretching in the transverse direction is carried out at the tenter, because the temperature at the final heat treatment zone that follow is high, failure to establish an intermediate zone would cause heat (hot air itself and/or radiated heat) from the final heat treatment zone to flow into the operation at which stretching in the transverse direction is carried out. If this were to happen, because the temperature in the zone in which stretching in the transverse direction is carried out would not be stable, not only would there be a tendency for unevenness in the thickness of the film to exceed 25%, but there would also be occurrence of variation in thermal shrinkage and other such physical properties.
  • the film be made to pass through an intermediate zone until a prescribed time has elapsed before final heat treatment is performed.
  • this intermediate zone it is important to block hot air from the final heat treatment zone and from the zone in which stretching in the transverse direction is carried out as well as any concomitant flow that would otherwise accompany movement of the film so that it becomes that rectangular strips come to hang down from above in almost perfectly vertical fashion when those strips have been made to hang down from above while the film is not passing therethrough.
  • the time of passage through the intermediate zone is on the order of 1 second to 5 seconds. When the time is less than 1 second, length of time in the intermediate zone will be insufficient, and there will be inadequate heat blocking effect.
  • longer times in the intermediate zone are preferred, because too long a time therein would result in increased equipment size, on the order of 5 seconds will be sufficient.
  • heat treatment zone it is preferred at the heat treatment zone that heat treatment be carried out at not less than 130° C. but not greater than 190° C. Because heat treatment promotes crystallization of the film, there is a tendency for it to reduce any thermal shrinkage that occurred during stretching operation(s). When heat treatment temperature is less than 130° C., this is not preferred because it would make it difficult to achieve a thermal shrinkage of not greater than 10%. On the other hand, when heat treatment temperature exceeds 190° C., this is not preferred because haze would tend to be greater than 30%. It is more preferred that the heat treatment temperature be not less than 135° C. but not greater than 185° C., and still more preferred that this be not less than 130° C. but not greater than 180° C.
  • the time of passage through the heat treatment zone be not less than 2 seconds but not greater than 20 seconds.
  • heat treatment will be meaningless because the film will pass through the heat treatment zone without the surface temperature of the film having reached the temperature setpoint. Because the longer the time of passage therethrough the greater will be the effect of heat treatment, it is more preferred that this be not less than 5 seconds. But because attempting to increase the length of time of passage therethrough would result in increased equipment size, as a practical matter it will be adequate if this is not greater than 20 seconds.
  • the film be made to undergo relaxation in the transverse direction within the range not less than 0% but not greater than 20% (a percent relaxation of 0% indicating that the film is not made to undergo relaxation).
  • the upper limit of the range in values for the percent relaxation is determined by the raw materials used, the conditions under which stretching in the transverse direction was carried out, and the heat treatment temperature, it will not be possible to cause the film to undergo relaxation to the point where this would be exceeded.
  • the upper limit of the range in values for the percent relaxation in the transverse direction is 20%.
  • a cooling airstream at not less than 10° C. but not greater than 30° C. be used to carry out cooling of the film for a passage time therethrough of not less than 2 seconds but not greater than 20 seconds.
  • the polyolefin-based film of the present invention may also be laminated with other polyolefin-based film(s) and/or film(s) comprising other material(s).
  • resins in films comprising other materials there is no particular limitation with respect thereto, it being possible to cite nylon resins, polyester resins, polystyrene-based resins, and the like as examples, any among which may be present therewithin in composite fashion.
  • film(s) laminated with the polyolefin-based film of the present invention may be such that at least a portion thereof includes gas barrier layer(s).
  • gas barrier layer raw material type there being no particular limitation with respect to gas barrier layer raw material type, conventionally known materials may be used, it being possible to select therefrom as appropriate in accordance with the object in question to satisfy the desired gas barrier characteristics and/or the like.
  • gas barrier layer raw material type silicon, aluminum, tin, zinc, iron, manganese, and other such metals, inorganic compounds comprising one or more of such metals, corresponding inorganic compounds in the form of oxides, nitrides, carbides, fluorides, and so forth may be cited as examples. Any of such inorganic substances and/or inorganic compounds may be used alone, or a plurality thereof may be used.
  • the polyolefin-based film of the present invention may be favorably used as packaging.
  • packaging vertical pillow pouches, horizontal pillow pouches, gusseted pouches, and other such pouches manufactured through use of heat sealing, weld pouches manufactured through use of weld seals, and so forth may be cited as examples.
  • packaging also includes lid members for plastic containers and labels for bottles which are formed in cylindrical fashion through use of center seals.
  • the packaging be made up of the film of the present invention.
  • the film of the present invention may be provided at any layer(s) of the packaging, from the standpoint of ability to visually perceive printing, it is preferred that an opaque film not be arranged toward the exterior from the film of the present invention.
  • heat sealing employing a heat seal bar (heat seal jaw), adhesion employing hot melt techniques, center sealing employing solvents, and/or other such conventionally known manufacturing methods may be employed.
  • CO 2 lasers (10600 nm), YAG lasers (1064 nm), YVO 4 lasers (1064 nm), fiber lasers (1090 nm), green lasers (532 nm), and UV lasers (355 nm) may be cited.
  • any thereamong may be used as desired without departing from the gist of the present invention.
  • use of YAG lasers, YVO 4 lasers, fiber lasers, green lasers, and UV lasers is preferred, use of Nd:YAG lasers, fiber lasers, green lasers, and UV lasers being particularly preferred.
  • Packaging having the film of the present invention may be favorably used as packaging material for foods, pharmaceutical agents, industrial products, and various other such goods.
  • F52011DG3 polypropylene (PP) manufactured by Sumitomo Chemical Co., Ltd.
  • Polyolefin B Sumikathene (registered trademark) FV407 (linear low density polyethylene (LLDPE) manufactured by Sumitomo Chemical Co., Ltd.) was used.
  • LLDPE linear low density polyethylene
  • Polyolefin A and “Iriotec (Registered Trademark) 8825” laser pigment manufactured by Merck. Performance Materials
  • Polyolefin A and Polyolefin B were mixed in a 95:5 mass % ratio as raw material for the laser printing layer (Layer A); Polyolefin A was used alone (100%) as raw material for the other layers (Layer B).
  • the raw materials mixed for Layer A and Layer B were respectively fed into different screw-type extruders, and Layer A and Layer B were each melted at 250° C. and were extruded from a T die at a shear rate of 280 sec ⁇ 1 .
  • agitators were attached directly above extruders, the mixed raw materials being fed into the extruders as they were made to undergo agitation by means of these agitators.
  • a feedblock was used partway along the flow paths of the respective molten resins so as to cause them to be joined, and this was expelled from a T die and cooled on a chill roller, the surface temperature of which was set to 30° C., to obtain unstretched laminated film.
  • the cooled and solidified unstretched laminated film which was obtained was guided to a machine direction stretching device in which a plurality of groups of rollers were arranged in continuous fashion, this was made to undergo preheating on preheating rollers until the film temperature reached 155° C., following which this was stretched by a factor of 4.5 ⁇ .
  • the film was guided to a transverse direction stretching device (tenter), where it was made to undergo preheating for 5 seconds until the surface temperature thereof reached 125° C., following which it was stretched by a factor of 8.2 ⁇ in the transverse direction (horizontal direction).
  • the film was guided while still in that state to an intermediate zone, being made to pass therethrough in 1.0 second.
  • the intermediate zone of the tenter note that hot air from the heat treatment zone and from the zone in which stretching in the transverse direction was carried out were blocked so that it became that rectangular strips came to hang down from above in almost perfectly vertical fashion when those strips had been made to hang down from above while the film was not passing therethrough.
  • the film was guided to the heat treatment zone, where heat treatment was carried out for 7 seconds at 165° C. At this time, at the same time that heat treatment was being carried out, the distance between clips in the transverse direction of the film was reduced, causing this to undergo 7% relaxation treatment in the transverse direction.
  • the film was cooled for 5 seconds in a cooling airstream at 30° C. Portions were cut and removed from the two edges thereof and this was rolled up into a roll 400 mm in width to continuously manufacture a prescribed length of biaxially stretched film of thickness 20 ⁇ m.
  • the properties of the film that was obtained were evaluated in accordance with the foregoing methods. Manufacturing conditions and the results of evaluation are shown in TABLE 2.
  • Working Examples 2 through 7 were conducted in similar fashion as at Working Example 1, raw material mixing conditions, expelling conditions, machine direction stretching temperature, machine direction stretching ratio, transverse direction stretching temperature, transverse direction stretching ratio, and heat treatment temperature being variously altered to continuously form polyolefin film.
  • Working Examples 4 through 7 were unstretched films.
  • Comparative Examples 1 through 4 were conducted in similar fashion as at Working Example 1, raw material mixing conditions, expelling conditions, machine direction stretching temperature, machine direction stretching ratio, transverse direction stretching temperature, transverse direction stretching ratio, and heat treatment temperature being variously altered to continuously form polyolefin film. Note that Comparative Example 2 was unstretched film. Manufacturing conditions and the results of evaluation for the respective films are shown in TABLE 2.
  • Film evaluation methods were as follows. Measurement samples were taken from the central region in the transverse direction of the film. Note that when due to the small area of the film or the like it could not immediately be determined which was the machine direction and which was the transverse direction, where measurements were made based on provisionally established determinations regarding the machine direction and the transverse direction, this should pose no particular problem even where the provisionally established determinations regarding the machine direction and the transverse direction were rotated by 90 0 from the true directions.
  • A4 size (21.0 cm ⁇ 29.7 cm) was cut from the film. A micrometer was used to measure thickness of this sample at 10 different locations, and the average thickness ( ⁇ m) was calculated.
  • a 0.1 g amount of sample was accurately weighed in a Teflon (registered trademark) container of a microwave sample digestion system (Multiwavepro; manufactured by Anton Paar), 6 mL of concentrated nitric acid was added to this, the special-purpose lid was placed thereon and this was inserted in the outer vessel therefor and was placed in the device. This was subjected to heated processing for 60 minutes at what was ultimately 200° C. in the device. This was thereafter allowed to cool to room temperature, 50 mL of the processed solution was placed in a digitube, and the Teflon (registered trademark) container as it existed following processing was while being washed with ultrapure water placed in same tube, this being treated as a 50 mL fixed volume thereof to prepare the measurement sample.
  • Teflon registered trademark
  • the processed solution was thereafter measured using a high-frequency inductively coupled plasma optical emission analyzer (Spectroblue; manufactured by Hitachi High-Tech Science Corporation), quantitative measurement of the amounts of metallic elements within the sample being carried out using calibration curves prepared using reference solutions for the target elements. Taking the amount of the element present within sample to be A (ppm), taking the concentration of the element in the solution before processing to be B (mg/L), and taking the concentration of the element in the blank test solution (measurement blank) to be C (mg/L), Formula (2), below, was used to determine the amount of the metallic element in 0.1 g of sample.
  • a 0.1 g amount of sample was accurately weighed in a crucible made of platinum, and this was precarburized to 400° C. on a hotplate.
  • a Model No. F0610 Electric Furnace manufactured by Yamato Scientific Co., Ltd. was thereafter used to carry out ashing processing for 8 hours at 550° C.
  • 3 mL of 6.0 N hydrochloric acid was added thereto, this was subjected to acidic decomposition at 100° C. on a hotplate, heated processing being carried out until the hydrochloric acid had been completely volatilized.
  • 20 mL of 1.2 N hydrochloric acid was used to obtain a fixed volume thereof.
  • the processed solution was thereafter measured using a high-frequency inductively coupled plasma optical emission analyzer (Spectroblue; manufactured by Hitachi High-Tech Science Corporation), quantitative measurement of the amounts of metallic elements within the sample being carried out using calibration curves prepared using reference solutions for the target elements. Taking the amount of the element present within sample to be A (ppm), taking the concentration of the element in the solution before processing to be B (mg/L), and taking the concentration of the element in the blank test solution (measurement blank) to be C (mg/L), Formula (3), below, was used to determine the amount of the metallic element in 0.1 g of sample.
  • a spectroscopic color difference meter (ZE-6000; manufactured by Nippon Denshoku industries Co., Ltd.) was used in reflection mode to measure L* value of a single film sample.
  • Film was irradiated with a laser to print the characters “0123456789”, and print density was evaluated by visual inspection.
  • a 355 nm-wavelength ultraviolet (UV) laser marker (MD-U1000; manufactured by Keyence Corporation) was used as printing apparatus, laser irradiation being carried out at conditions of laser power 40%, scan speed 1000 mm/second, pulse frequency 40 kHz, and spot variability ⁇ 20.
  • Print density was judged based on the following criteria. GOOD Characters were recognizable as a result of visual inspection BAD Characters were unrecognizable as a result of visual inspection
  • Example 2 Example3 Example4 Example5 Example6 Example7
  • Example 2 Example 3
  • Example 4 Manufacturing Raw material composition at Polyolefin A 95 96 97 0 95 0 96 100 97 93 95 conditions laser printing layer (Layer A) Polyolefin B 0 0 0 95 0 97 0 0 0 0 [mass %] Polyolefin C 5 4 0 0 5 0 4 0 0 0 0 0 Polyolefin D 0 0 3 5 0 3 0 0 3 7 5 Raw material composition at Polyolefin A 100 100 100 0 100 0 100 0 100 100 100 100 100 layers (Layer B) other than Polyolefin B 0 () 0 100 0 100 0 0 0 0 0 0 0 Layer A [mass %] Polyolefin C 0 0 0 0 0 0 0 0 0 0 0 0 Polyolefin
  • polyolefin film in accordance with the present invention makes it possible to provide a film in accordance therewith that is capable of being printed in distinct fashion by a laser, that excels with respect to unevenness in thickness, and that is of high transparency, it may be favorably used for labels and other such applications. It at the same time makes it possible to provide packaging which employs such film and on which printing has been directly carried out.

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